MartinK received kudos from MichalJ in ESET Cloud Administartor - Client Installer
Could you please provide logs located in directory %temp%\eset\ (i.e. in temporary directory of user that executed installer)? This specific error means that it was not possible to find installer matching requirements. Most commonly when in case:
version of product is no longer available (if version was explicitly requested when configuring installer) operating system is not supported by selected product (desktop vs. server products) ESET repository servers (repository.eset.com) are not available. Access might be blocked by other security-related software, or HTTP proxy configuration might be required.
MartinK received kudos from Peter Randziak in Activation fail. ECP.20006
Certificate that is considered by ESET products as untrusted, i.e. injected into communication has following identifiers inside:
IP Address=fe80:0000:0000:0000:...:2a5a IP Address=192.....204 DNS Name=localhost DNS Name=G....net.local which might help you identify source.
Otherwise certificate contains no other details, it actually like like default certificate that is generated for ESMC Webconsole, but it makes no sense to be injected into communication. Could you verify this certificate is used by your ESMC console for Apache Tomcat connections (I have made some redaction of data present in certificate)?
Also as you mentioned, MAC addresses from communication with ESET licensing server (IP=126.96.36.199) indicates that next device is Sophos, but it does not mean it is source of this injected certificate.
MartinK received kudos from Peter Randziak in Future changes to ESET Security Management Center / ESET Remote Administrator
Unfortunately I am al so not sure how it was meant. We are officially declaring maximal number of managed clients to 10000 when using MySQL database, but it is not related to number of actually connecting clients, but rather limit is amount of data. ESMC installed over MySQL might have performance issues with processing larger amount of data and rendering larger datasets. As an result rendering of specific reports (threats for example) might be much slower, but in "clean" network even much larger environments can be managed with MySQL-based ESMC installation.
Persistent connections as introduced in ESMC should actually significantly reduce load of ESMC server, especially in "dormant" state when no changes are made in management console. If properly configured on recommended HW, ESMC should handle hundreds of clients per second.